fix: 修复 input、textarea 组件快速输入（删除）光标闪烁的问题

src/core/view/components/input/index.vue

@@ -8,7 +8,7 @@
       class="uni-input-wrapper"
     >
       <div
-        v-show="!(composing || inputValue.length)"
+        v-show="!(composing || valueSync.length)"
         ref="placeholder"
         :style="placeholderStyle"
         :class="placeholderClass"
@@ -17,7 +17,7 @@
       />
       <input
         ref="input"
-        v-model="inputValue"
+        v-model="valueSync"
         :disabled="disabled"
         :type="inputType"
         :maxlength="maxlength"
@@ -36,27 +36,18 @@
 </template>
 <script>
 import {
-  emitter,
-  keyboard
+  baseInput
 } from 'uni-mixins'
 const INPUT_TYPES = ['text', 'number', 'idcard', 'digit', 'password']
 const NUMBER_TYPES = ['number', 'digit']
 export default {
   name: 'Input',
-  mixins: [emitter, keyboard],
-  model: {
-    prop: 'value',
-    event: 'update:value'
-  },
+  mixins: [baseInput],
   props: {
     name: {
       type: String,
       default: ''
     },
-    value: {
-      type: [String, Number],
-      default: ''
-    },
     type: {
       type: String,
       default: 'text'
@@ -96,7 +87,6 @@ export default {
   },
   data () {
     return {
-      inputValue: this._getValueString(this.value),
       composing: false,
       wrapperHeight: 0,
       cachedValue: ''
@@ -131,15 +121,9 @@ export default {
     focus (value) {
       value && this._focusInput()
     },
-    value (value) {
-      this.inputValue = this._getValueString(value)
-    },
-    inputValue (value) {
-      this.$emit('update:value', value)
-    },
     maxlength (value) {
-      const realValue = this.inputValue.slice(0, parseInt(value, 10))
-      realValue !== this.inputValue && (this.inputValue = realValue)
+      const realValue = this.valueSync.slice(0, parseInt(value, 10))
+      realValue !== this.valueSync && (this.valueSync = realValue)
     }
   },
   created () {
@@ -196,11 +180,11 @@ export default {
       if (~NUMBER_TYPES.indexOf(this.type)) {
         if (this.$refs.input.validity && !this.$refs.input.validity.valid) {
           $event.target.value = this.cachedValue
-          this.inputValue = $event.target.value
+          this.valueSync = $event.target.value
           // 输入非法字符不触发 input 事件
           return
         } else {
-          this.cachedValue = this.inputValue
+          this.cachedValue = this.valueSync
         }
       }
 
@@ -209,14 +193,13 @@ export default {
         const maxlength = parseInt(this.maxlength, 10)
         if (maxlength > 0 && $event.target.value.length > maxlength) {
           $event.target.value = $event.target.value.slice(0, maxlength)
-          this.inputValue = $event.target.value
+          this.valueSync = $event.target.value
           // 字符长度超出范围不触发 input 事件
           return
         }
       }
-
-      this.$trigger('input', $event, {
-        value: this.inputValue
+      this.$triggerInput($event, {
+        value: this.valueSync
       })
     },
     _onFocus ($event) {
@@ -247,16 +230,13 @@ export default {
       }
     },
     _resetFormData () {
-      this.inputValue = ''
+      this.valueSync = ''
     },
     _getFormData () {
       return this.name ? {
-        value: this.inputValue,
+        value: this.valueSync,
         key: this.name
       } : {}
-    },
-    _getValueString (value) {
-      return value === null ? '' : String(value)
     }
   }
 }

src/core/view/components/textarea/index.vue

@@ -49,26 +49,17 @@
 </template>
 <script>
 import {
-  emitter,
-  keyboard
+  baseInput
 } from 'uni-mixins'
 const DARK_TEST_STRING = '(prefers-color-scheme: dark)'
 export default {
   name: 'Textarea',
-  mixins: [emitter, keyboard],
-  model: {
-    prop: 'value',
-    event: 'update:value'
-  },
+  mixins: [baseInput],
   props: {
     name: {
       type: String,
       default: ''
     },
-    value: {
-      type: [String, Number],
-      default: ''
-    },
     maxlength: {
       type: [Number, String],
       default: 140
@@ -116,7 +107,6 @@ export default {
   },
   data () {
     return {
-      valueSync: this._getValueString(this.value),
       valueComposition: '',
       composition: false,
       focusSync: this.focus,
@@ -148,19 +138,6 @@ export default {
     }
   },
   watch: {
-    value (val) {
-      this.valueSync = this._getValueString(val)
-    },
-    valueSync (val) {
-      if (val !== this._oldValue) {
-        this._oldValue = val
-        this.$trigger('input', {}, {
-          value: val,
-          cursor: this.$refs.textarea.selectionEnd
-        })
-        this.$emit('update:value', val)
-      }
-    },
     focus (val) {
       if (val) {
         this.focusChangeSource = 'focus'
@@ -210,7 +187,6 @@ export default {
     })
   },
   mounted () {
-    this._oldValue = this.$refs.textarea.value = this.valueSync
     this._resize({
       height: this.$refs.sensor.$el.offsetHeight
     })
@@ -283,7 +259,12 @@ export default {
     _input ($event) {
       if (this.composition) {
         this.valueComposition = $event.target.value
+        return
       }
+      this.$triggerInput($event, {
+        value: this.valueSync,
+        cursor: this.$refs.textarea.selectionEnd
+      })
     },
     _getFormData () {
       return {
@@ -293,9 +274,6 @@ export default {
     },
     _resetFormData () {
       this.valueSync = ''
-    },
-    _getValueString (value) {
-      return value === null ? '' : String(value)
     }
   }
 }

src/core/view/mixins/base-input.js

+import {
+  debounce,
+  throttle
+} from 'uni-shared'
+import emitter from './emitter'
+import keyboard from './keyboard'
+
+export default {
+  name: 'BaseInput',
+  mixins: [emitter, keyboard],
+  model: {
+    prop: 'value',
+    event: 'update:value'
+  },
+  props: {
+    value: {
+      type: [String, Number],
+      default: ''
+    }
+  },
+  data () {
+    return {
+      valueSync: this._getValueString(this.value)
+    }
+  },
+  watch: {
+    valueSync (value) {
+      this.$emit('update:value', value)
+    }
+  },
+  created () {
+    const valueChange = this.__valueChange = debounce((val, oldVal) => {
+      this.valueSync = this._getValueString(val)
+    }, 100)
+    this.$watch('value', valueChange)
+    this.__triggerInput = throttle(($event, detail) => {
+      this.$trigger('input', $event, detail)
+    }, 100)
+    this.$triggerInput = ($event, detail) => {
+      this.__valueChange.cancel()
+      this.__triggerInput($event, detail)
+    }
+  },
+  beforeDestroy () {
+    this.__valueChange.cancel()
+    this.__triggerInput.cancel()
+  },
+  methods: {
+    _getValueString (value) {
+      return value === null ? '' : String(value)
+    }
+  }
+}

src/core/view/mixins/index.js

@@ -23,7 +23,12 @@ export {
 }
   from './keyboard'
 
+export {
+  default as baseInput
+}
+  from './base-input'
+
 export {
   default as interact
 }
-  from './interact'
+  from './interact'

src/shared/util.js

@@ -86,11 +86,37 @@ export function guid () {
 
 export function debounce (fn, delay) {
   let timeout
-  return function () {
+  const newFn = function () {
     clearTimeout(timeout)
     const timerFn = () => fn.apply(this, arguments)
     timeout = setTimeout(timerFn, delay)
   }
+  newFn.cancel = function () {
+    clearTimeout(timeout)
+  }
+  return newFn
+}
+
+export function throttle (fn, wait) {
+  let last = 0
+  let timeout
+  const newFn = function (...arg) {
+    const now = Date.now()
+    clearTimeout(timeout)
+    const waitCallback = () => {
+      last = now
+      fn.apply(this, arg)
+    }
+    if (now - last < wait) {
+      timeout = setTimeout(waitCallback, wait - (now - last))
+      return
+    }
+    waitCallback()
+  }
+  newFn.cancel = function () {
+    clearTimeout(timeout)
+  }
+  return newFn
 }
 
 export function kebabCase (string) {